The UK spelling is centralise, but the US spelling is centralize.

to centralise/to centralize

Corresponding verb to the noun central is centralise (or centralize)

the organisational issues of the purchasing function focus on the purchasing function of an organisation in a decentralisation or centralise manner.

Data centralization within organizations is crucial and essential. It can be achieved when you store and backup all of your organization's data in a secure online cloud so that all departments can access it at the same time and also there is no worry of losing it.